I am attempting to knit together the lofted surfaces that I have created with the faces of the extruded ribs (shown below) but I am encountering the message "the selected faces and surfaces cannot be knitted into one surface." After this, I intend to thicken the surface knit by 0.25mm.

As an aside, I had asked this question earlier, but I did not get any responses, but what I am attempting to model is a wind turbine rib cage with a fabric wrapped around it and then aluminum around that. This has been my approach thus far. I have also included a picture of what I am trying to replicate (obviously with much less detail, as my CAD abilities are not that advanced).

Hi Paul! Thanks so much for your response. This is exactly the approach I was looking to use, but for some reason, when I was doing the surface loft and thicken, it wasn't working for me. Unfortunately though, I still have one last step to do, which is to add a layer of the aluminum around this fabric wrap.

The fabric wrap looks great, but I will also have to do finite element analysis on the blade, where the two wrapped surfaces around the rib cage are two different materials of different thicknesses. So, essentially it would be:

Would it be possible to wrap a 10mm "layer of aluminum" around this model that you have currently modified? (and then import this into a program such as ANSYS (for FEA) where it will recognize the two wrapped sections of material - the kevlar and aluminum)